The DS1822 is a digital thermometer with ±2°C accuracy over a -10°C to +85°C range. Data is read out over a 1-Wire® serial bus in 2's complement format with 9 to 12 bits of resolution (user-programmable).
The DS1822 offers thermostatic functionality with over-temperature (TH) and under-temperature (TL) user-programmable setpoints stored in on-chip EEPROM. An internal flag is set when the measured temperature is greater than TH or less than TL. If thermostatic operation is not required, the two bytes of EEPROM reserved for TH and TL may be used for general-purpose nonvolatile storage.
Each DS1822 features a unique and unchangeable 64-bit silicon serial number, which serves as the bus address for the sensor. This allows multiple DS1822 devices to coexist on the same 1-Wire bus. The DS1822 may be locally powered via a 3.0V to 5.5V supply, or power can be derived from the 1-Wire data line ("parasite power").
The DS1822 is offered in 3-pin TO-92 (DS1822) and 150mil 8-pin SO (DS1822Z) packages. In addition, the DS1822 is available in a parasite-power only version, the DS1822-PAR. Also available is the high-precision DS18B20, which provides ±0.5°C accuracy and is software-compatible with the DS1822.
Key Features
Applications/Uses
±2°C accuracy from -10°C to +85°C
Measures temperatures from -55°C to +125°C (-67°F to +257°F)
9- to 12-bit user-configurable resolution
1-Wire interface requires only one port pin for communication
Has a 64-bit unique and unchangeable electronic serial number
Multi-drop capability for simplified distributed temperature sensing
Alarm function with user-defined non-volatile alarm settings
Converts temperature to 12-bit digital word in 750ms (max.)
No external components required to measure temperature
3.0V to 5.5V supply range
Optional "parasite-power" operation (power derived directly from 1-Wire bus)
3-pin TO-92 (DS1822) and 150mil 8-pin SO (DS1822Z) packages
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
1-7
of
7
DS1822
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TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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RoHS/Lead-Free? Materials Analysis
DS1822Z
SOIC;8 pin;31 mm²
Dwg: 56-G2008-001C (PDF)
Use pkgcode/variation: S8-2*
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